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On this day in Lewis & Clark history...

On his way back to Fort Mandan, Clark collects pumice stone and clay. Curious about the Indian way of making beads, he experiments by melting the pumice and clay in a furnace. The last of the six new canoes are carried to the river.

From the journals...

I collected some Pumice Stone, burnt Stone & hard earth and put them into a furnace, the hard earth melted and glazed the other two a part of which i, e, the Hard Clay became a Pumice-Stone

William Clark

Pumice stone

Frothy, sporous rock with glassy sheen

Photo ©2009 Benjamin444. Permission via the GNU Free Documentation License.